<style>
  .col-xs-6 > section {
    width: 200px;
    height: 100px;
    border: 1px solid red;
    text-align: center;
    margin-top: 20px;
  }
</style>
<div>
  <div class="row">
    <div class="col-xs-6 col-sm-3">
      <section>
        <strong>校内新闻</strong>
        <p>20</p>
      </section>
    </div>
    <div class="col-xs-6 col-sm-3">
      <section>
        <strong>通知公告</strong>
        <p>20</p>
      </section>
    </div>
    <div class="col-xs-6 col-sm-3">
      <section>
        <strong>学术活动</strong>
        <p>30</p>
      </section>
    </div>
    <div class="col-xs-6 col-sm-3">
      <section>
        <strong>媒体聚焦</strong>
        <p>84</p>
      </section>
    </div>
  </div>
</div>
